To wonder why on earth someone would do the following

[NeedsAsockamnesty]

Walk into a room pick up a baby that was not theirs and change its bum and clothes when they had been done within about 10 mins and genuinely did not need doing.

Every single time you came into contact with the same baby?

And no it's nothing to do with a mil

And there is no back story at all, I like my sister she likes me, she has never criticised me or my parenting in any way. When she looked after a friemds older kids (friend was in hospital and dad was away) she spent ages on the phone to me checking all the plans she has and the meals she was thinking of were ok.

She's not normally weird in any way at all.

Yes sorry baby is mine

And there really is no context at all, she's never done anything like it at all and ive had lots of babies.
She's never shown much if any interest in any of them.

I should just ask shouldnt I

That is odd. Maybe she doesn't know what else to do with a baby? Maybe she just likes doing it? Trying to practice it? Very weird. Just ask her, I'm sure she'll tell you.

Can you catch her before she does it, pick up the baby and tell her she doesn't need changing?

Or simply give the baby to her when it does need changing?

Perhaps she is feeling a little broody and just likes doing things for her niece. I had little cousins before I had my two and I do admit to the urge to keep changing their clothes like little dolls.

Is she pregnant and practicing? Or broody and trying or coming to terms with not being able to?

Lots of babies? How many?

Is there any way in which this baby is different from all the others?

Is she fairly young? I would say it is probably just a novelty thing and she likes doing it. Nice interaction with her niece/nephew.

Does she have kids?
Do you think she wants a baby?
I am not suggesting she is being creepy but she may be doing a bit of pretend with yours if she is feeling broody?

I'm trying to imagine the scenario where every time your sister comes to visit the baby, the nappies and clothes are all in the same room and you aren't holding the baby and are otherwisr occupied. This is the only scenario in which I can imagine this happening otherwise surely you would have time to say something to stop this happening.

Her saying "I don't mind" isn't really relevant.
What matters is that you might mind (nappies aren't free) and the baby might mind. A lot of babies aren't too keen on nappy changes, especially if they are perfectly dry at the time.

Next time she goes to do it, just intervene and say "she doesn't need to be changed at the moment but I'm sure [Baby] would love you to do it when it next needs to be done"

When she says, "I don't mind" tell her that you do! You're the parent, not her. No matter how well meaning she is, if your child doesn't need changing, then there's no need to do it.

As long as she's paying for the wasted nappy!

She's probably just trying to be helpful, but doesn't have a clue.

Just politely point out that your baby doesn't need changing but maybe suggest cuddles and playing instead, so she can still interract . Sounds like she is either a bit broody or genuinely trying to help with her new niece.

I usually stand up when she walks in to greet her having put the baby down, nappies aren't an issue cost wise they just get chucked in a bucket, and because my mobility is not that great and so I don't bother the people that are about to help me to much I tend to have a basket near by with enough for each day (nappies baby grows and vests and dribble bibs) in.

I liked changing nephews nappys (but only when they were dirty and parents OK) just to practice because I wanted my own baby.

Maybe that's her reason? Practicing for the future?

Right ive just sent her a text nicely asking why.

Probably not the best conversation to have by text. Prepare for things to get awkward..

Sock this is really odd. Just realised it's you which makes it even odder that she's started doing it now.

Does she perhaps think it's helpful in some odd way?

Is she redressing in gendered or gender neutral clothes to make a statement? 😂

Is she indeed pregnant and having a practice?

She's just replied saying practising.

I'm hoping this means she's not intending on taking up kidnapping babies as a hobby or anything

Mouldy

I often have very awkward text conversations with my sister usually involving a odd shag or run away from game.

Just asked her if she's off to one of those places they leave babies outside to steal one or is she planning on kidnapping mine seen as she likes him.

practicing? Buy her a dolly and hide all nappies and baby clothes in the meantime.

Ive just told her she needs to come and practise some more so I can have a nice undisturbed bath.

Because I'm going to be an aunty!

Has she just told you she's pregnant?